how can you do/say that
Wie kannst du so was sagen!
How can you say something like that!
— Volver - Zurückkehren (2006)
Oh, wie kannst du so was nur sagen!
Oh, how can you say such a thing!
Wie kannst du so was tun!
How could you do something like that!
— Kein Sterbenswort (2006)
Wie kannst du so was sagen?
How can you say something like that?
— Crazy Rich (2018)
Wie kannst du so was auch nur in Erwägung ziehen?
How could you even consider something like that?
— Psycho (1960)